IBM WebSphere eXtreme Scale deserialization injection vulnerability

IBM WebSphere eXtreme Scale is an elastic data caching and object grid platform developed by American company IBM. IBM WebSphere eXtreme Scale has a deserialization injection vulnerability, allowing attackers to execute arbitrary code on the grid replication layer...

PT-2026-53942

Name of the Vulnerable Software and Affected Versions IBM WebSphere Extreme Scale versions 8.6.1.0 through 8.6.1.6 Description Three ObjectInputStream subclasses WsObjectInputStream, ObjectStreamPool$ReusableInputStream, and ObjectInputStreamResolver do not install a JEP-290 class filter, which i...

CVE-2026-13759: Deserialization of Untrusted Data

IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 ships three ObjectInputStream subclasses WsObjectInputStream, ObjectStreamPool$ReusableInputStream, ObjectInputStreamResolver that install no JEP-290 class filter; when Coherence is on the classpath, multiple RCE gadget chains including...